Pulverizer



V. S. WALL PULVERI ZER pri 8, 1941.

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PULVERIZER April 8, 1941.

Filed Aug. 24, 1939 2 Sheets-Sheet 2 Till! Patented Apr. 8, 1941 UNITED STATES PATENT @FFME PULVERIZER Vel-ner S. Wall, Mount Union, Pa.

Application August 24, 1939, Serial No. 291,741

(Cl. SE-) 4 Claims.

This invention relates to pulverizers or grinding mills.

An object of this invention is` to provide a grinding mill or pulverizer which is so constructed that the material to be pulverized or ground may be continuously fed into the machine, the ground material being withdrawn from the machine by a fan suction or separating means.

Another object of this invention is to provide a grinding mill of this type including a rotatable housing and an annular grinding member loosely disposed within the housing `and provided with grinding teeth or elements on the periphery thereof which are adapted to engage the material to be ground or pulverized.

A further object of this invention is to provide a machine of this type which is provided with a removable wear ring and also with a removable grinding member so that after the ring and the member become unduly worn they may be readily replaced.

A further object of this invention is to provide an improved means forsupporting the wear ring and` grinding element, the supporting means including opposed wedge members which after the wear ring and the grinding element have-` been unduly worn may be removed so as to permit the replacement of the wear ring and the grinding element.

A still further object of this invention is to provide a grinding mill or pulverizer of this type which is so constructed that the grinding member is adapted by reason of the weight thereof to pulverize the material to the desired degree upon engagement of the material between the ends of the teeth and the wear ring.

A still further object of this invention is to provide a rotatable pulverizer of this character and an improved means for rotating the device.

A further object of this invention is to provide a structure of this kind including an improved rotatable housing which is so `constructed that the incoming material is adapted to be engaged within the lower portion of the rotatable housing, the

housing being so constructed that the incoming which fall within the scope of the invention asv claimed.

In the drawings- Figure l is a vertical section partly broken away of a grinding mill constructed according to an embodiment of this invention,

Figure 2 is a sectional view taken on the line 2--2 of Figure l,

Figure 3 is a fragmentary front elevation of the mill,

Figure 4 is a sectional View taken on the line 4-4 of Figure 1, and

Figure 5 is a sectional view taken on the lin 5--5 of Figure 1.

Referring to the drawings numeral vIll desighates generally a rotatable housing which includes a pair of oppositely disposed; complementary head or side wall members I I and l Ia and a body partl in the form of a cylindrical ring l2 disposed be-,-l

. It, an outwardly directed hollow trunnion I5 having a flared inner portion Iii merging into the` edge of the aperture of the part hl, anlannular outer wall forming part I'I connected with the part I4 by an intermediate wall forming part consisting oi an inwardly curved outwardly directed portion I8 and an outwardly curved downwardly directed portion I9. The portion It merges into the inner end of part I'I. The portion I94 merges into the outer end of part I4. The intermediate i wall forming part disposes the part Il in inwardly offset relation with respect to the partiel. The part Il is formed on its inner face in proximity to its outer end with a shoulder or seat 2l] which is provided at the inner edgenwith an end-v less flange 2.I integral with the inner face of part Il and flush withthe outer end of the latter.

The member IIal comprises an axially aper. tured` circular inner wall forming` part 22., an out-4 wardly directed hollow trunnion 23 having a flared inner portion 24 merging into the edge of the aperture of part 22, an outer annular wall forming part 25 connected with the part 24 by an` part 22. The part is formed on its inner face in proximity to the outer end with a shoulder or seat 29 provided at the inner edge with an endless flange 28 integral with the inner face of part 25 and flush with the outer end of the latter.

In practice the two wall 'members II and IIa are constructed substantially identical so that these two members may be cast from the same pattern or mold.

When the housing is assembled the body part or ring I2 is arranged between and abuts the inner faces of the parts I1, 25 of the heads or members II, IIa and also bears against the seats provided by the anges 2l, 29. The bolts I3 hold the heads or members I`I, IIa and body part I2 in assembled position, but they pass through the ilanges 2 I, 29 outwardly of body part I2.

When the heads or members II, IIa and body part I2 `are assembled, they provide a grinding chamber formed with what may be termed an outer -portion and an inner portion and with the former of less width than the latter, that is to say the inner portion of the grinding chamber is extended laterally in opposite directions with respect to said outer portion to form a grinding' chamber with a reduced outer portion. The inner and outer portions of the grinding chamber are coaxially arranged, as is shown, and the outer portion, at its inner end, opens into the outer end of the inner portion.

The trunnion I5 is journaled in a bearing 3l) carried by the supporting legs 3| and 32 and constitutes the outlet for the grinding chamber. The trunnion 23 is journaled in the bearing 33 carried by vertical legs 34 and a supporting leg 35 and constitutes the intake for the grinding chamber. 'Ihe supporting structures for the bearings `and 33 are constructed in the form of a tripod and are adapted to be anchored or otherwise suitably secured to a floor or other supporting means. A cylindrical wear ring 36 is disposed interiorly of the body part or ring I2 within the narrow portion of the grinding chamber and is arranged in proximity to the wide inner portion of the grinding chamber. The ring is maintained in inwardly spaced relation to the body part of ring I2 b v means of a plurality of opposed wedges 31 and 38. The wear ring 36 is disposed between the ytwo outer wall forming parts I1 and 25 and the inner surface of the wear ring 36 forms a grinding surface on which the material to be ground or pulverized is adapted to engage.

The side wall II is provided on the exterior thereof with a plurality of radially disposed bracing members 39 and the side wall member Il.a is also provided with a plurality of radially disposed bracing members 40. A weighted revoluble upstanding grinding structure 4I is disposed loosely in the inner portion of the grinding chamber and during the operation of the housing the lower `part of the structure 4I will extend into the bottom of the reduced outer portion of the grinding chamber for the purpose of engaging with the ring 36. The structure 4I includes an inner grinding element formed of a ring 42 having a plurality of radially disposed and circumferentially spaced apart grinding teeth 43 on its outer face. The spaces 44 between the grinding teeth 43 form pockets open at each end in which the ground and also some of the unground material is adapted to engage and also provides a means whereby the material in the housing Il) is thoroughly agitated and mixed during the rotation of the housing I0 and also the rotation of the grinding element 4I. The outer surfaces 45 of the teeth 43 form the grinding surface which are adapted to engage the inner surface of the wear ring 35. The depth of the teeth 43, is, as shown, slightly greater than the distance between the wear ring 35 and the inner end of the reduced outer portion of the grinding chamber. The structure 4I includes a weight 46 disposed within the ring 42, having a diameter relatively less than the inner diameter of the ring 42. The weight 46 is held concentrically of the ring 42 by means of opposed wedge members 41 and 48. The weight 45 consists of a solid circular disc and as shown has its .thickness correspond to the width of the body of the ring 42. The width of the body of the ring 42 corresponds substantially to the width of the reduced portion of the grinding chamber. The teeth 43 have their side edges flush with the edges of the ring 42.

On the operation of the mill certain of the teeth 43 will co-act with opposed portions of the inner faces of the wall forming parts I1 and 25 to thereby maintain the structure 4I upright and spaced from the parts I`4, 22 of the heads II, IIa. The ring 42, weight 46 and wedges 41, 48 are permanently spaced from the part-s I4, I1, I8, I9 of head II and the parts 22, 25, 25, 21 of the head Il a. One side of the structure 4I co-acts with the head II to form the intake side of the grinding chamber and the opposite side of the said structure 4I co-acts with the head IIa to form the outlet side of the grinding chamber. The trunnion 23 constitutes the intake for the intake side of the grinding chamber and the trunnion I5 forms the outlet for the outlet side of said chamber.

The trunnion 23 on the interior thereof is provided with a ring or annular member 49 having a central opening 59 constituting an intake opening through which the material is adapted to be discharged into the housing Ill. A feed trough 5I is supported in any suitable manner so that the feed trough 5I will project through the opening 50 in the ring 49 and discharge the material into the housing I0. The ring 49 provides a means whereby the incoming material will be prevented from working outwardly through the trunnion 23. The incoming material is adapted to move downwardly in the space 52 provided between the wall member 22 and the adjacent face of the grinding element 4I. The outwardly curved portion 21 is adapted to feed the incoming material beneath the grinding element 4I' and preferably the quantity of material fed into the housing ID is only suiiicient so that a major portion of the material will be thoroughly ground or pulverized at each rotation of the housing I0 and the rotatable grinding element 4I.

The trunnion I5 comprises an outlet for the nulverized material and a ring '53 is disposed within the trunnion I5. An outlet pipe 54 is extended into the ring 53 and is connected to a separator housing 55. The separator housing 55 as shown in Figure 4 comprises side walls 56, end walls 51, a top wall 58 and `a bottom wall 59. A reticulated screen 60 is disposed in the separator housing 53 between the end walls 51. An outlet pipe 6I is connected to a side wall 56 opposite from the pipe 54 and is connected to a suction fan E2 operated by any suitable power means which is adapted to draw `air through the separator 55. The bottom wall 53 of the separator 55 is provided with a hopper 63 having a carry-off pipe 64 connected thereto so that the pulverized material dropping downwardly on the inner face of the screen 55 may be removed.

The housing lil is provided on one side thereof and preferably in the side Il* with a ring gear 55 which is secured by fastening members 66 to the bracing members 40. A driven gear 61 is secured to a motor shaft B8 which is `driven by a motor 69; In practice the shaft 68 is adapted to be driven at a reduced speed by suitable reducing gears which may be incorporated in the motor structure 69. The motor 69 is mounted on a bracket 10 which is secured as by fastening members 'li to one of the legs 34.

In the use and operation of this grinding mill or pulverizer the crushed material in the form'of rock or the` lil-ie is discharged into the housing l through the feed trough 5I. The motor 69 will rotate the housing I0 at the desired speed and coactively with the rotation of the housing I0 the grinding element 4I will rotate therewith and in the same direction. The fan 62 is rotated at a suitable speed so as to draw air through the housing I', the air entering the housing IU through the interior o-f the trunnion 23 and passing through the opening 50 in the ring 49. As the housing and the grinding element 4| rotate the teeth 43 on the grinding element 4l will crush the hard material fan-d the pulverized material will be agitated by the rotation of the housing lll so that the dust can be readily drawn out of the housing l0 by the movement of the air formed by the suction fan B2. The powder will pass through the trunnion l which forms the outlet for the material and will then strike the screen E30 in the separator housing 55. The air will :pass through the screen El) and the ground material will ldrop downwardly into the hopper B3 and may then be `carried off by the carry-off 4pipe 64. The speed of feeding the material through the trough 5I can be determined so that a continuous feeding of the material may be had and the fan 62 will draw oi the ground material at the same rate that the material is fed into the housing itl. In this manner the depth of the material in the hou-sing I0 will not be such that the material will pile up in the space 5'1. The material passing through the space 52 will be engaged partly beneath the teeth 43 and in the spaces 44 between adjacent teeth.

As the rotor or grinding member 4l rotates with the housing the unground material will be discharged from the space between the teeth and will be carried around the housing until the unground material engages between the grinding surface 45 of the teeth 44 and the inner surface of the wear ring 35. The weight of the grinding element 44 is such that the unground material member 4l in an upright position at all times. In

addition to this the outwardly convergent surface formed at the outwardly curved extensions i9 and 2l of the side walls l l and Ila respectively will serve as a guide means to lead the rotor or grinding element dll into the space between the flanges Il and 25.

With a grinding mill of this character the material'to be ground will be continuously fed into the mill and where the material to be ground is relatively soft a lighter rotor or grinding element 4l may be used. In other words, the weight of the grinding element 4l will depend in part upon the character of the material which is to be ground and the degree to which the material is to be ground or pulverized.

What I claim is: i

1. In a pulverizing mill, a revcluble housing including an annular body and a pair of oppositely disposed axially apertured heads having integral therewith outwardly directed trunnions merging into the edges of the apertures of said heads, said heads being formed with inset outer parts abut ting the ends of and detachably secured to said bOdY, said heads and body correlating to provide a grinding chamber having outer and inner coaxially arranged portions, said outer portion being of reduced width with respect to said inner portion, an annular wear member abutting against the inner faces of said inset outer parts inwardly of said body and having its inner face providing a grinding surface disposed in said re duced outer portion in proximity to said inner portion, oppositely disposed wedges for mainn taining said body and member in spaced relation, an upstanding revolubie solid circular weight of disc-like form loosely disposed within said inner portion, spaced from said heads and aligning with and being substantially of a thickness corresponding to the width of said reduced portion, an inner annular grinding element encompassing in spaced relation the edge of said weight and opposing said member, oppositely disposed wedges between the inner face of said element and the edge of said weight for maintaining said element in spaced relation to said edge and to provide for said element and weight bodily revolving, and said inner element being provided on its outer face with spaced parallel teeth transversely of such face and flush with its side edges, said teeth being encompassed by said member and certain of them extending'into the lower part of said reduced portion of said chamber and engaging said member for maintaining said weight upright and spaced from said heads;

2. In a pulverizer, a revoluble housing including a pair of oppositely disposed heads of like form each having an outer part provided on its inner face with an endless annular flange, an axially apertured circular inner part and an annular curved intermediate part merging into and vdisposed in angular relation with respect to the said outer part for disposing the inner part in outwardly offset relation with respect to said outer part, said housing including an annular body arranged between said outer parts and abutting said flanges, means for securing said heads and body in abutting relation, said body correlating with the said parts of said heads to provide within the housing a grinding chamber formed of an outer portion and an inner portion disposed coaxially and merging into each other, said outer portion being of reduced width with respect to said inner portion, said housing including a pair of oppositely disposed hollow trunnions integral with the edges of the apertures of the said inner parts and opening into opposite sides of the inner portion of said chamber, an annular wear member arranged in the reduced portion of said chamber in proximitty to and spaced from said body, the inner face of said member providing a grinding surface disposed in proximity to the inner portion of said chamber, oppositely disposed wedges maintaining said body and member in spaced re" lation, an upstanding revoluble solid circular disc-like weight loosely arranged in the inner portion of said chamber and substantially corresponding in thickness to the width of the reduced portion of said chamber, an annular inner grinding element including a ring encompassing in spaced relation the edge of said Weight, oppositely disposed Wedges between the inner face of said ring and the edge of said weight for maintaining them in spaced relation and to provide for said ring and weight bodily revolving, the body of said ring corresponding in Width to the thickness of said Weight, and said inner grinding element including spaced parallel teeth disposed transversely of the outer face of and flush with the side edges of said ring thereby providing pockets open at each end, certain of said teeth on the operation of the housing extending into the reduced portion of the chamber to engage said member and to maintain said Weight upstanding and spaced from said head.

3. A pulverizing mill comprising a revoluble housing providing a grinding chamber formed of an outer portion having an outer and a pair of side walls and an inner portion having axially apertured side walls, said portions opening into each other, disposed coaxially and with the inner portion of greater width than said outer portion. an annular outer grinding element secured in the said outer portion in proximity to said inner portion, an upstanding revoluble Weight loosely mounted in the said inner portion and in the form of a solid circular disc, an annular inner grinding element including a ring encompassing in spaced relation the edge of said Weight and opposing said outer element, means correlating with the inner face of said ring and the edge of said weight for maintaining said inner element in spaced relation to said edge and to provide for said element and weight bodily revolving together, said ring being formed circumferentially throughout its outer face with transversely disposed spaced parallel teeth forming pockets opening at each end, said weight being spaced from the side walls of said inner portion, said housing including oppositely extending tubular trunnions for intake and discharge respectively to and from said chamber, said trunnions merging into the edges of the apertures of the said side Walls of the inner portion of said chamber, an upstanding support in the form of an annulus having its outer edge secured to the inner face of the discharge trunnion intermediate the ends of the latter, a combined separator and suction structure arranged exteriorly of said discharge trunnion. and a conduit supported at its inner end from the inner edge of said support' and having its outer end opening into said structure.

4. A pulverizing mill comprising a revoluble housing providing a grinding chamber formed of an outer portion having an outer and a pair of side walls and an inner portion having axially apertured side Walls, said portions opening into each other, disposed coaxially and with the inner portion of greater Width than said outer portion, an annular outer grinding element secured in the said outer portion in proximity to said inner portion, an upstanding revoluble weight loosely mounted in the said inner portion and in the form of a solid circular disc, an annular inner grinding element including a ring encompassing in spaced relation the edge of said weight and opposing said outer element, means correlating with the inner face of said ring and the edge of said Weight for maintaining said inner element in spaced relation to said edge and to provide for said element and Weight bodily revolving together, said ring being formed circumferentially throughout its outer face With transversely disposed spaced parallel teeth forming pockets opening at each end, said weight being spaced from the side Walls of said inner portion, said housing including oppositely extending tubular trunnions for intake and discharge respectively to and from said chamber, said trunnions merging into the edges of the apertures of the said side Walls of the inner portion of said chamber, a material arrester in the form of a vertical annulus having its outer edge secured against the inner face of the intake trunnion intermediate the ends of the latter, an inclined director for incoming material supported by and extending through said arrester and depending into such trunnion, an upstanding support in the form of an annulus having its outer edge secured to the inner face of the discharge trunnion intermediate the ends of the latter, a combined separator and suction structure arranged exteriorly of said discharge trunnion, and a conduit supported at its inner end from the inner edge of said support and having its outer end opening into said structure.

VERNER. S. WALL. 

